diff --git a/google-analytics-admin/composer.json b/google-analytics-admin/composer.json
index ae12ffb..3ab5549 100644
--- a/google-analytics-admin/composer.json
+++ b/google-analytics-admin/composer.json
@@ -6,7 +6,7 @@
     "require-dev": {
         "google/cloud-tools": "dev-main",
         "squizlabs/php_codesniffer": "^4.0",
-        "phpunit/phpunit": "^10.0",
+        "phpunit/phpunit": "^13.0",
         "friendsofphp/php-cs-fixer": "^3.46"
     }
 }
diff --git a/google-analytics-data/composer.json b/google-analytics-data/composer.json
index 069fe23..6c5bd09 100644
--- a/google-analytics-data/composer.json
+++ b/google-analytics-data/composer.json
@@ -6,7 +6,7 @@
     "require-dev": {
         "google/cloud-tools": "dev-main",
         "squizlabs/php_codesniffer": "^4.0",
-        "phpunit/phpunit": "^10.0",
+        "phpunit/phpunit": "^13.0",
         "friendsofphp/php-cs-fixer": "^3.46"
     }
 }